restoring

Isn't it true that if I buy a software unlocked iphone off ebay I will have to restore it to sync my itunes account? Therefore I would have to unlock it myself because itunes deletes everything? Or am I able to sync 2 itunes account on one iphone?

What DOES it do?

I was wondering if it helps because my ps3's bluray drive is dead. it doesnt play bluray games but does play ps2 and dvd. I have a 60gb ps3.

I have very stupidly deleted something that i didn't want to in the recycle bin. It is a mp4 movie. If anyone has any software they can recommend or step-by-step guide i would be very appreciated.